CN202309505U - Startup and shutdown control circuit for power amplifying power supply - Google Patents
Startup and shutdown control circuit for power amplifying power supply Download PDFInfo
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- CN202309505U CN202309505U CN2011202769087U CN201120276908U CN202309505U CN 202309505 U CN202309505 U CN 202309505U CN 2011202769087 U CN2011202769087 U CN 2011202769087U CN 201120276908 U CN201120276908 U CN 201120276908U CN 202309505 U CN202309505 U CN 202309505U
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Abstract
The utility model provides a startup and shutdown control circuit for a power amplifying power supply, which comprises a switching circuit, a controller, a controller starting branch, a voltage adjusting circuit, a controller power supply branch and a feedback branch. The switching circuit controls connection and disconnection of the controller starting branch and the controller power supply branch simultaneously, and normal startup and shutdown of the power amplifying power supply are achieved. Simultaneously, a feedback signal which is fed back to a controller feedback (FB) pin through the feedback branch is led out from an output end so that protection of startup and shutdown states, output shortcircuit and overload of a power supply is achieved. The startup and shutdown control circuit for the power amplifying power supply can achieve a normal startup and shutdown function of the power supply under the premise that a protection function and performance of the power supply are guaranteed.
Description
Technical field
The utility model relates to a kind of control circuit, especially a kind of amplifier power supply switching on and shutting down control circuit.
Background technology
In the power-supply system of DVD+ power amplifier joint product, be made up of two parts usually, a part is that a part is the power supply of power amplifier in addition to the accessory power supply of DVD power supply.
FAN6754 is the green pattern PWM controller of a Highgrade integration; The multinomial outstanding function that strengthens the inverse-excitation type converter performance can be provided; Like: HV start-up system (the highest 700V of bearing), can reduce the frequency modulation technology of EMI, and higher integrated level is to save outer relay part etc.Use this controller; Can obtain than the higher reliability of the solution that adopts the discrete element and lower BOM cost, lower assembly cost, so generally adopt the PWM controller of this FAN6754 chip on the market as power amplifier part power circuit in the DVD+ power amplifier hybrid power system.
Consulting Fig. 1, is the typical circuit figure of a kind of available technology adopting FAN6754 chip as power amplifier part power supply in the DVD+ power amplifier hybrid power system of PWM controller.From the technical manual of FAN6754, can recognize have and only have two kinds of approach can realize power on/off function, first kind is to HV foot control system, in the time of second kind to VDD foot control system.
Can realize the startup of amplifier power supply through control HV pin, but the supply power voltage that starts the back chip provides independently by the auxiliary winding of VDD pin, then when disconnection HV pin, the amplifier power supply system is operate as normal still, can't realize the shutdown function of power-supply system.
The power supply that accessory power supply through DVD part provides voltage signal to carry out the VDD pin, and utilize the break-make of this voltage signal of switching signal control, thus realize the normal switch machine function of amplifier power supply system; But when adopting this mode, when amplifier power supply partly is in open loop situations or output short-circuit, the VDD over-voltage protecting function of FAN6754 chip will be lost; And behind the over current protection; When load restoration just often, power supply can not recover operate as normal, so power supply reliability can be unstable.
The utility model content
In view of this, the utility model technical problem that will solve provides a kind of amplifier power supply normal switch machine of can realizing does not influence the control circuit of this amplifier power supply performance simultaneously.
Thus, the utility model adopts following technical scheme to realize:
A kind of amplifier power supply switching on and shutting down control circuit; Comprise that a switching circuit, a controller, a controller start branch road, controller power supply branch road, a voltage-regulating circuit, a feedback branch; Described controller starts branch road and connects switching circuit, and voltage-regulating circuit connects switching circuit, and controller power supply branch road connects voltage-regulating circuit; The break-make of switching circuit control VCC signal; The VCC signal starts branch road start-up control device through controller, and VCC signal and controller are adjusted the voltage-regulating circuit output voltage jointly, and the generation one voltage via controller power supply branch road of voltage-regulating circuit is that controller provides running voltage.Wherein said switching circuit comprises a coupling circuit, a first transistor, a transistor seconds; Wherein coupling circuit meets switching signal ON/OFF, and the first transistor connects coupling circuit and VCC signal, and transistor seconds connects the first transistor; The break-make of switching signal ON/OFF control coupling circuit; Control the first transistor conducting after the coupling circuit conducting, controller starts after the first transistor conducting, and the first transistor and controller are controlled the break-make of transistor seconds simultaneously.Wherein said coupling circuit is a photoelectrical coupler, and this photoelectrical coupler comprises a light-emitting component and a light-sensitive element, and wherein light-emitting component meets switching signal ON/OFF, and light-sensitive element connects the first transistor.Wherein said controller is FAN6754.
Switching signal ON/OFF time control light-emitting component luminous for high level; And then the conducting of control light-sensitive element; To make the first transistor conducting after the light-sensitive element conducting, this moment, the VCC signal was divided into the two-way electric current after through the first transistor, and wherein one road electric current starts branch road through controller and flows to controller HV pin; For controller provides starting resistor, another road current direction transistor seconds.Voltage-regulating circuit comprises a transformer and an electronic switching tube; The break-make of the GATE end output one control signal control transistor seconds of controller; According to the transistor seconds break-make, thereby another road electric current is according to the break-make of the break-make control electronic switching tube of transistor seconds.Transformer comprises one first primary coil, one second primary coil and a level coil; Through the break-make of controlling electronic switching tube and then the break-make of controlling first primary coil; Thereby control the induced voltage of second primary coil; Controller power supply branch road connects the controller VDD pin and second primary coil, is that controller provides running voltage thereby make the induced voltage of second primary coil through controller power supply branch road.
The secondary coil of described transformer is an output, draws a feedback signal through the FB of feedback branch controller pin from output, and controller carries out the protection of open loop situations, output short-circuit and the overload of power supply through the feedback signal that detection FB pin receives.
Compared to prior art; A kind of amplifier power supply switching on and shutting down control circuit of the utility model; Control the break-make that controller starts branch road and controller power supply branch road simultaneously through a switching circuit; Thereby realize the normal switch machine of amplifier power supply circuit, draw the feedback signal that feeds back to controller FB pin once feedback branch by output simultaneously, thereby realized the protection of open loop situations, output short-circuit and the overload of power supply.
Description of drawings
Fig. 1 is the typical application circuit of FAN6754 controller;
Fig. 2 is the execution mode circuit diagram of the utility model.
Embodiment
Consult Fig. 2, the execution mode circuit diagram of the utility model.A kind of amplifier power supply switching on and shutting down control circuit comprises that a switching circuit, a controller, a controller start branch road, controller power supply branch road, a voltage-regulating circuit, a feedback branch.Described controller starts branch road and connects switching circuit; Voltage-regulating circuit connects switching circuit; Controller power supply branch road connects voltage-regulating circuit, the break-make of switching circuit control VCC signal, and the VCC signal starts branch road start-up control device through controller; VCC signal and controller are adjusted the voltage-regulating circuit output voltage jointly, and the generation one voltage via controller power supply branch road of voltage-regulating circuit is that controller provides running voltage.Wherein said switching circuit comprises a coupling circuit, a first transistor, a transistor seconds; Wherein coupling circuit meets switching signal ON/OFF, and the first transistor connects coupling circuit and VCC signal, and transistor seconds connects the first transistor; The break-make of switching signal ON/OFF control coupling circuit; Control the first transistor conducting after the coupling circuit conducting, controller starts after the first transistor conducting, and the first transistor and controller are controlled the break-make of transistor seconds simultaneously.Wherein said coupling circuit is a photoelectrical coupler, and this photoelectrical coupler comprises a light-emitting component and a light-sensitive element, and wherein light-emitting component meets switching signal ON/OFF, and light-sensitive element connects the first transistor.Wherein said controller is FAN6754.
In the present embodiment, switching circuit comprises a photoelectricity coupling circuit, a first transistor, and the first transistor is a positive-negative-positive triode Q5, a transistor seconds here, and transistor seconds is a NPN type triode Q8 here.
The photoelectricity coupling circuit here is a photoelectrical coupler IC7; Photoelectrical coupler IC7 comprises a light-emitting component and a light-sensitive element, and light-emitting component is a light-emitting diode D11 here, and light-sensitive element is a phototriode Q11; Light-emitting diode D11 positive pole meets switching signal ON/OFF; Negative pole is through the cold ground of a resistance R 29 power supply secondary, and the photoinduction end of phototriode Q11 is relative with light-emitting diode D11, is used to receive the light signal that light-emitting diode D11 sends.The emitter of phototriode Q11 connects the former limit of power supply thermally, and collector electrode is connected to triode Q5 through a resistance R 30.The emitter of triode Q5 is connected to the VCC signal, and this VCC signal is that the accessory power supply of DVD power supply provides, and the emitter of triode Q5 is connected to the collector electrode of phototriode Q11 through a resistance R 31.
Draw the two-way branch road from the collector electrode of triode Q5; One branch road is that controller starts branch road, is connected to the HV pin of controller through a resistance R 50, for controller provides starting resistor; This road circuit is the controller start-up circuit, and another branch road is connected to the collector electrode of a transistor seconds Q8 through R37.Wherein triode Q8 base stage is connected to the GATE pin of controller through a resistance R 36, and emitter is through a resistance R 39 ground connection.
Voltage-regulating circuit comprises a transformer TR2 and an electronic switching tube, and wherein transformer comprises one first primary coil, one second primary coil, a level coil.Here electronic switching tube is a FET Q2.
First primary coil, one termination of transformer is received high direct voltage Vbus, and the other end is connected to the drain electrode of FET Q2.Second primary coil, one end ground connection; An other end is through a diode D12; And then be connected to the VDD pin of controller through a resistance R 40; Wherein between VDD pin and resistance R 40, connect the low-pass filter network that a capacitor C 21 and a capacitor C 23 are formed, this second primary coil, diode D12, resistance R 40, capacitor C 21, the capacitor C 23 common controller power supply branch roads of forming, it provides a constant voltage dc source for controller.The secondary coil of transformer is connected to load, is used for electric.
The grid of FET Q2 is for controlling the emitter that the utmost point is connected to triode Q8, and its drain electrode is connected to first primary coil of transformer, and source electrode is through a biasing resistor RS ground connection.
The output of secondary coil, a parallelly connected light-emitting diode (not indicating), through the light signal an of phototriode (not indicating) this light-emitting diode that is coupled (not indicating), thus the FB pin of a current feedback to the controller that is coupled out.
During this amplifier power supply switching on and shutting down control circuit operate as normal; Switching signal ON/OFF opens; This moment, light-emitting diode D11 was normally luminous, and its light signal that sends is coupled to phototriode Q11 and makes phototriode Q11 conducting, and VCC signal one road was flowed through and was conducting to the former limit of power supply thermally through phototriode Q11 behind the R31 this moment; This move will drag down the voltage of resistance R 30, and make triode Q5 conducting.After the triode Q5 conducting; The VCC signal is divided into the two-way electric current after through triode Q5; One road branch current via controller starts the HV pin that branch road is applied directly to controller, and for controller provides starting resistor, another road branch current is received the collector electrode of triode Q8 through resistance R 37.
After electric current via controller startup branch road is applied to controller HV pin; Controller will start; This moment, controller was received the base stage of triode Q8 through resistance R 36 by GATE pin out gate signal; When GATE pin output high level, triode Q8 conducting, this moment, the VCC signal will be through connecing to ground after the Q8 and the resistance R 39 of flowing through.This moment, the voltage of FET Q2 source electrode was the voltage of resistance R 39, FET Q2 conducting this moment, and this moment, high direct voltage Vbus flow through first primary coil.
And when GATE pin output low level, triode Q8 ends, and this moment, resistance R 39 voltage were zero, so FET Q2 grid voltage is zero, and FET Q2 ends, and first primary coil does not have current flowing.That is to say, in the conducting of FET Q2 and between the off period, time-dependent current when first primary coil produces.This time time-dependent current effect under, first primary coil induces a time-varying magnetic field.Thereby the width control of the gate signal through the output of rational conditioning controller should the time time-dependent current, just can realize the intensity of time-varying magnetic field is adjusted.
Second primary coil spot magnetic induction phenomenon and produce one first induced voltage under the effect of time-varying magnetic field; Carry out after the halfwave rectifier through a resistance R 40 through diode D12; Carry out receiving controller VDD pin after LPF forms a direct current through capacitor C 21 and capacitor C 23 again, as the running voltage of controller.
Parallel connection of secondary windings one light-emitting diode as output of transformer (for indicating); And adopting a phototriode (for indicating) that the light signal of this light-emitting diode (for indicating) is coupled into the FB pin that a feedback signal is connected to controller, controller carries out the protection of open loop situations, output short-circuit and the overload of power supply through the feedback signal that detection FB pin receives.
When switching signal ON/OFF broke off, light-emitting diode D11 quit work, and phototriode Q11 ends, and this moment, triode Q5 base stage was a high voltage; Therefore triode Q5 ends, and this moment, the electric current of access controller HV pin was zero, and controller can not start; The electric current that inserts triode Q8 simultaneously is zero, so FET Q2 ends, and first primary coil does not have electric current; Therefore second primary coil does not have voltage to produce, and controller VDD pin does not have the voltage input, so controller can not be worked.
Compared to prior art, a kind of amplifier power supply switching on and shutting down control circuit that the utility model provided comprises a photoelectrical coupler IC7, a triode Q5, a triode Q8.Control a photoelectrical coupler IC7 through a switching signal ON/OFF; And then the break-make of control triode Q5; Thereby the conducting of control VCC signal with end, and then the control controller starts the break-make of branch road, thereby and through the conducting of triode Q8 control FET Q2 and break-make by control controller power supply branch road; Therefore, a kind of amplifier power supply switching on and shutting down control circuit that adopts the utility model to provide can be realized the normal switch machine function of power supply.Owing to the FB pin of introducing a feedback signal to controller at power output end, therefore can realize the protection of open loop situations, output short-circuit and the overload of power supply in addition.
Claims (4)
1. amplifier power supply switching on and shutting down control circuit; Comprise that a switching circuit, a controller, a controller start branch road, controller power supply branch road, a voltage-regulating circuit, a feedback branch; It is characterized in that: described controller starts branch road and connects switching circuit, and voltage-regulating circuit connects switching circuit, and controller power supply branch road connects voltage-regulating circuit; The break-make of switching circuit control VCC signal; The VCC signal starts branch road start-up control device through controller, and VCC signal and controller are adjusted the voltage-regulating circuit output voltage jointly, and the generation one voltage via controller power supply branch road of voltage-regulating circuit is that controller provides running voltage.
2. a kind of amplifier power supply switching on and shutting down control circuit as claimed in claim 1; It is characterized in that: described switching circuit comprises a coupling circuit, a first transistor, a transistor seconds; Wherein coupling circuit meets switching signal ON/OFF, and the first transistor connects coupling circuit and VCC signal, and transistor seconds connects the first transistor; The break-make of switching signal ON/OFF control coupling circuit; Control the first transistor conducting after the coupling circuit conducting, controller starts after the first transistor conducting, and the first transistor and controller are controlled the break-make of transistor seconds simultaneously.
3. a kind of amplifier power supply switching on and shutting down control circuit as claimed in claim 2; It is characterized in that: described coupling circuit is a photoelectrical coupler; This photoelectrical coupler comprises a light-emitting component and a light-sensitive element, and wherein light-emitting component meets switching signal ON/OFF, and light-sensitive element connects the first transistor.
4. a kind of amplifier power supply switching on and shutting down control circuit as claimed in claim 1, it is characterized in that: described controller is FAN6754.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202769087U CN202309505U (en) | 2011-08-02 | 2011-08-02 | Startup and shutdown control circuit for power amplifying power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202769087U CN202309505U (en) | 2011-08-02 | 2011-08-02 | Startup and shutdown control circuit for power amplifying power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202309505U true CN202309505U (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202769087U Expired - Fee Related CN202309505U (en) | 2011-08-02 | 2011-08-02 | Startup and shutdown control circuit for power amplifying power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202309505U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052253A (en) * | 2013-03-12 | 2014-09-17 | 力博特公司 | Power source switch control circuit |
-
2011
- 2011-08-02 CN CN2011202769087U patent/CN202309505U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052253A (en) * | 2013-03-12 | 2014-09-17 | 力博特公司 | Power source switch control circuit |
| CN104052253B (en) * | 2013-03-12 | 2016-12-28 | 力博特公司 | Power on-off control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20130802 |