CN101771353A - Auxiliary source circuit for switch power supply - Google Patents
Auxiliary source circuit for switch power supply Download PDFInfo
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Abstract
The invention discloses an auxiliary source circuit for a switch power supply, which comprises a first diode, a second diode, a first inductor, a first capacitor and a second capacitor, and is characterized in that one end of the first capacitor is connected with the positive end of an input voltage Vin, the other end of the first capacitor is connected with one end of the first inductor and the anode of the second diode, the other end of the first inductor is connected with the cathode of the first diode, the cathode of the second diode is connected with the positive end of the second capacitor, the negative end of the input voltage Vin is connected with the anode of the first diode and the negative end of the second capacitor, and the voltage of the second capacitor is the output voltage Vo of the auxiliary source circuit. The invention has the beneficial effects that: 1. the invention can provide the auxiliary power supply voltage in full output range for circuits with wide output range; 2. the invention has low energy consumption, simple structure and low cost; and 3. the lossless absorption of the switch tube in the main circuit is realized.
Description
Technical field
The present invention relates to a kind of auxiliary source circuit that is applicable to Switching Power Supply.Should be a kind of Switching Power Supply that is used for specifically, low-loss auxiliary power circuit.
Background technology
In the switching power circuit, the power supply of its control circuit generally adopts the mode of the auxiliary winding of transformer to power, with reference to Fig. 1, the output voltage of auxiliary winding is Va, the secondary winding output voltage is Vo1, main circuit output voltage V o, and auxiliary winding is powered to control circuit by the three-terminal voltage-stabilizing circuit.But in the switching power circuit of wide region output, if output voltage V o is extremely low, then Vo1 is extremely low, and then the voltage Va of auxiliary winding also can be very low, and will possibly can't provide control circuit required voltage; Simultaneously, if the voltage magnitude of the Va when having satisfied low output voltage, the loss meeting of the three-terminal voltage-stabilizing circuit during high output voltage in the auxiliary circuit is very high.
In the prior art, also there is the mode that does not adopt the auxiliary winding of transformer that the method for accessory power supply is provided, as U.S. Pat 6233165, with reference to Fig. 2, though the auxiliary source circuit of this mode is not subjected to the restriction of output voltage, but owing to the energy of the auxiliary source that provides at this circuit is relevant with the size of capacitor C 1, if satisfy wide output voltage range work, then the capacity of capacitor C 1 is bigger, the drain-source utmost point that is equivalent to main switch is parallel with big electric capacity, and the switching loss of switching tube is bigger, and the resistance R in the loop 2, the further loss of the circuit that increases is unfavorable for the high efficiency of power supply.
Summary of the invention
The present invention is directed to the problem that prior art exists, propose a kind of novel auxiliary power circuit, low-loss and be applicable to the circuit of wide region output.
The technical scheme that addresses the above problem employing is: a kind of auxiliary source circuit that is applicable to Switching Power Supply, comprise first diode, and second diode, first inductance, first electric capacity and second electric capacity is characterized in that:
The anode of one termination input voltage of described first electric capacity, one end of another termination first inductance of first electric capacity and the anode of second diode, the negative electrode of another termination first diode of first inductance, the negative electrode of second diode connects the anode of second electric capacity, the negative terminal of input voltage vin connects the anode of first diode and the negative terminal of second electric capacity, and the voltage on second electric capacity is the output voltage of auxiliary source circuit.
Wherein, described input voltage is a square-wave voltage, and output voltage is a level voltage, and as the accessory power supply voltage of other circuit in the Switching Power Supply.
A kind of auxiliary source circuit that is applicable to Switching Power Supply of the present invention, main circuit starts constantly, and busbar voltage provides accessory power supply by the resistance of main circuit for control circuit.During the main circuit steady operation, the operation principle of auxiliary source circuit is as follows: when the switching tube of main circuit when conducting state is transformed into cut-off state, its drain-source voltage is given the charging of second electric capacity by first electric capacity and second diode, provides control circuit required energy; When the switching tube of main circuit is transformed into when opening from off state, form lossless absorption circuit by first electric capacity and first inductance and first diode, with first electric capacity previous stage energy stored discharge, and be unlikely to increase the turn-on consumption of switching tube.
Beneficial effect of the present invention:
1. in the circuit of wide region output, can provide the accessory power supply voltage of full output area.
2. loss is low, and is simple in structure, and cost is low.
3. can realize the harmless absorption of main circuit switch pipe.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 prior art circuits figure one.
Fig. 2 prior art circuits figure two.
Fig. 3 auxiliary source circuit that is applicable to Switching Power Supply of the present invention.
Fig. 4 main circuit of the present invention is the circuit diagram of example with the circuit of reversed excitation.
Fig. 5 main circuit of the present invention is the circuit diagram of example with the forward converter.
Fig. 6 main circuit of the present invention is the circuit diagram of example with the symmetrical half bridge circuit.
Fig. 7 main circuit of the present invention is the circuit diagram of example with the asymmetry half-bridge circuit.
Specific embodiment
With reference to Fig. 1, prior art circuits figure one, auxiliary winding mode is powered to control circuit, the output voltage of the auxiliary winding of main transformer is Va, the secondary winding output voltage is Vo1, main circuit output voltage V o, the output termination three-terminal voltage-stabilizing circuit of auxiliary winding, the Vcc of the output connection control circuit chips IC of three-terminal voltage-stabilizing circuit.
With reference to Fig. 2, prior art circuits figure two, and the existing circuit that does not adopt auxiliary winding mode to power, switching tube Q1 shutdown moment among the figure, drain-source voltage are by capacitor C 1, and resistance R 2 and diode D2 give electrochemical capacitor C2 charging; And the moment of opening as switching tube Q1, capacitor C 1 is by resistance R 2 and switching tube Q1 discharge, and its energy is by resistance R 2 losses, and increased the turn-on consumption of switching tube Q1.
With reference to Fig. 3, the auxiliary source circuit that is applicable to Switching Power Supply of the present invention, comprise diode D1 and diode D2, inductance L 1, capacitor C 1, capacitor C 2, the anode of one termination input voltage vin of described capacitor C 1, L1 one end of another termination inductance of capacitor C 1 and the anode of diode D2, the negative electrode of another terminating diode D1 of inductance L 1, the negative electrode of diode D2 connects the anode of capacitor C 2, and the negative terminal of Vin connects the anode of diode D1 and the negative terminal of capacitor C 2, and the voltage on the capacitor C 2 is the output voltage V o of auxiliary source circuit.
Wherein, described input voltage vin is a square-wave voltage, and output voltage V o is a level voltage, and as the accessory power supply voltage of other circuit in the Switching Power Supply.
With reference to Fig. 4, a kind of auxiliary source circuit that is applicable to Switching Power Supply, main circuit is a circuit of reversed excitation, comprise main circuit input voltage Vbus, auxiliary source circuit, chip IC, main transformer T1, switching tube Q1, resistance R 1, sampling resistor Rs, output diode D3, output electrochemical capacitor C3, output voltage V o ', specifically: described auxiliary source circuit comprises diode D1 and D2, inductance L 1, capacitor C 1, electrochemical capacitor C2, the end of the positive terminating resistor R1 of described main circuit input voltage Vbus and the former limit of main transformer T1 winding non-same polarity, main circuit input voltage Vbus negative terminal is former border district, the anode of another termination electrochemical capacitor C2 of resistance R 1, the negative electrode of diode D2 and the Vcc of chip IC end, the negative terminal of electrochemical capacitor C2 connects former border district, the anode of diode D2 connects an end of capacitor C 1 and an end of inductance L 1, the negative electrode of another terminating diode D1 of inductance L 1, and the anode of diode D1 connects former border district, another former limit of termination main transformer winding end of the same name of capacitor C 1 and the drain electrode of switching tube Q1, the gate pole of switching tube Q1 connects the Gate end of chip IC, and its source electrode connects the end of sampling resistor Rs, the former border district of another termination of sampling resistor Rs; The anode of main transformer secondary winding terminating diode D3 of the same name, the negative electrode of diode D3 connects the anode of electrochemical capacitor C3, the negative terminal of electrochemical capacitor C3 connects the non-same polarity and the output ground of main transformer T1 secondary winding, and electrochemical capacitor C3 both end voltage is output voltage V o '.
Wherein, resistance R 1 constantly provides accessory power supply required voltage for main circuit starts.
With reference to Fig. 5, a kind of auxiliary source circuit that is applicable to Switching Power Supply, main circuit is a forward converter, comprise main circuit input voltage Vbus, auxiliary source circuit, chip IC, main transformer T1, switching tube Q1, resistance R 1, sampling resistor Rs, rectification diode D3, sustained diode 4, outputting inductance L2, output electrochemical capacitor C3, output voltage V o ', specifically: described auxiliary source circuit comprises diode D1 and D2, inductance L 1, capacitor C 1, electrochemical capacitor C2, the end of the positive terminating resistor R1 of described main circuit input voltage Vbus and the former limit of main transformer T1 winding end of the same name, main circuit input voltage Vbus negative terminal is former border district, the anode of another termination electrochemical capacitor C2 of resistance R 1, the negative electrode of diode D2, with the Vcc end of chip IC, the negative terminal of electrochemical capacitor C2 connects former border district, and the anode of diode D2 connects an end of capacitor C 1 and an end of inductance L 1, the negative electrode of another terminating diode D1 of inductance L 1, the anode of diode D1 connects former border district, another former limit of termination main transformer winding non-same polarity of capacitor C 1 and the drain electrode of switching tube Q1, and the gate pole of switching tube Q1 connects the Gate end of chip IC, its source electrode connects the end of sampling resistor Rs, the former border district of another termination of sampling resistor Rs; The anode of main transformer T1 secondary winding terminating diode D3 of the same name, the negative electrode of diode D3 connects the negative electrode of diode D4 and an end of inductance L 2, the anode of another termination electrochemical capacitor C3 of inductance L 2, the negative terminal of electrochemical capacitor C3 connects the non-same polarity and the output ground of main transformer secondary winding, and electrochemical capacitor C3 both end voltage is output voltage V o '.
Wherein, resistance R 1 constantly provides accessory power supply required voltage for main circuit starts.
With reference to Fig. 6, a kind of auxiliary source circuit that is applicable to Switching Power Supply, main circuit is the symmetrical half bridge circuit, comprise main circuit input voltage Vbus, auxiliary source circuit, chip IC, main transformer T1, switching tube Q1, resistance R 1, switching tube Q2, capacitor C 3, capacitor C 4, diode D3, diode D4, output electrochemical capacitor C5, output electrochemical capacitor C6, output voltage V o ', specifically: described auxiliary source circuit comprises diode D1 and D2, inductance L 1, capacitor C 1, electrochemical capacitor C2, the end of the positive terminating resistor R1 of described main circuit input voltage Vbus, main circuit input voltage Vbus negative terminal is former border district, the anode of another termination electrochemical capacitor C2 of resistance R 1, the negative electrode of diode D2, with the Vcc end of chip IC, the negative terminal of electrochemical capacitor C2 connects former border district, and the anode of diode D2 connects an end of capacitor C 1 and an end of inductance L 1, the negative electrode of another terminating diode D1 of inductance L 1, the anode of diode D1 connects former border district, the source electrode of another termination switching tube Q2 of capacitor C 1 and the drain electrode of switching tube Q1, and the drain electrode of switching tube Q2 connects main circuit input voltage Vbus anode, the source electrode of switching tube Q1 connects former border district, the gate pole of switching tube Q1 and switching tube Q2 connects the Gate end of chip IC, the termination main circuit input anode of capacitor C 3, an end of another termination capacitor C 4 and the former limit of main transformer winding non-same polarity, another termination main circuit input negative terminal of capacitor C 4, the source electrode of the former limit of main transformer winding termination switching tube of the same name Q2 and the drain electrode of switching tube Q1 and an end of capacitor C 1; The anode of main transformer T1 secondary winding terminating diode D3 of the same name and the negative electrode of diode D4, the negative electrode of diode D3 connects the anode of electrochemical capacitor C5, the anode of diode D4 connects the negative terminal of electrochemical capacitor C6, the anode of the negative terminal of electrochemical capacitor C5 and electrochemical capacitor C6 links to each other and connects the non-same polarity of transformer T1 secondary winding, the anode of electrochemical capacitor C5 is the anode of output voltage V o ', and the negative terminal of electrochemical capacitor C6 is the negative terminal of output voltage V o '.
Wherein, resistance R 1 constantly provides accessory power supply required voltage for main circuit starts.
With reference to Fig. 7, a kind of auxiliary source circuit that is applicable to Switching Power Supply, main circuit is an asymmetry half-bridge circuit, comprise main circuit input voltage Vbus, auxiliary source circuit, chip IC, main transformer T1, switching tube Q1, resistance R 1, capacitance C7, switching tube Q2, diode D3, diode D4, output electrochemical capacitor C5, output electrochemical capacitor C6, output voltage V o ', specifically: described auxiliary source circuit comprises diode D1 and D2, inductance L 1, capacitor C 1, electrochemical capacitor C2, the end of the positive terminating resistor R1 of described main circuit input voltage Vbus, main circuit input voltage Vbus negative terminal is former border district, the anode of another termination electrochemical capacitor C2 of resistance R 1, the negative electrode of diode D2 and the Vcc of chip IC end, the negative terminal of electrochemical capacitor C2 connects former border district, the anode of diode D2 connects an end of capacitor C 1 and an end of inductance L 1, the negative electrode of another terminating diode D1 of inductance L 1, and the anode of diode D1 connects former border district, the source electrode of another termination switching tube Q2 of capacitor C 1 and the drain electrode of switching tube Q1 and the end of capacitance C7, the drain electrode of switching tube Q21 connects main circuit input voltage Vbus anode, and the source electrode of switching tube Q1 connects former border district, and the gate pole of switching tube Q1 and switching tube Q2 connects the Gate end of chip IC, the end of the same name of the former limit of another termination main transformer T1 winding of capacitance C7, the former limit of main transformer winding non-same polarity connect main circuit input Vbus negative terminal; The anode of main transformer T1 secondary winding terminating diode D3 of the same name and the negative electrode of diode D4, the negative electrode of diode D3 connects the anode of electrochemical capacitor C5, the anode of diode D4 connects the negative terminal of electrochemical capacitor C6, the anode of the negative terminal of electrochemical capacitor C5 and electrochemical capacitor C6 links to each other and connects the non-same polarity of transformer T1 secondary winding, the anode of electrochemical capacitor C5 is the anode of output voltage V o ', and the negative terminal of electrochemical capacitor C6 is the negative terminal of output voltage V o '.
Wherein, resistance R 1 constantly provides accessory power supply required voltage for main circuit starts.
At last, it is also to be noted that what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought the protection range of inventing.
Claims (6)
1. an auxiliary source circuit that is applicable to Switching Power Supply comprises first diode (D1), second diode (D2), and first inductance (L1), first electric capacity (C1) and second electric capacity (C2) is characterized in that:
The anode of one termination input voltage (Vin) of described first electric capacity (C1), one end of another termination first inductance (L1) of first electric capacity (C1) and the anode (D2) of second diode, the negative electrode of another termination first diode (D1) of first inductance (L1), the negative electrode of second diode (D2) connects the anode of second electric capacity (C2), the negative terminal of input voltage (Vin) connects the anode of first diode (D1) and the negative terminal of second electric capacity (C2), and the voltage on second electric capacity (C2) is the output voltage (Vo) of auxiliary source circuit.
2. a kind of auxiliary source circuit that is applicable to Switching Power Supply as claimed in claim 1 is characterized in that described input voltage (Vin) is the square-wave voltage that Switching Converter Topologies produced of any form.
3. a kind of auxiliary source circuit that is applicable to Switching Power Supply as claimed in claim 1, it is characterized in that described input voltage (Vin) is the inner square-wave voltage that produces of circuit of reversed excitation, described output voltage (Vo) provides accessory power supply voltage for circuit of reversed excitation, described circuit of reversed excitation comprises circuit of reversed excitation input voltage (Vbus), auxiliary source circuit, chip (IC), main transformer (T1), first switching tube (Q1), sampling resistor (Rs), first resistance (R1), output diode (D3), output capacitance (C3), circuit of reversed excitation output voltage (Vo '), one end and the former limit of the main transformer winding non-same polarity of positive termination first resistance (R1) of described circuit of reversed excitation input voltage (Vbus), circuit of reversed excitation input voltage (Vbus) negative terminal is former border district, the Vcc end of another chip termination (IC) of first resistance (R1), the drain electrode of the former limit of main transformer winding termination first switching tube of the same name (Q1), the drain electrode of first switching tube (Q1) and former border district are two inputs of auxiliary source circuit, the output plus terminal of auxiliary source circuit connects the Vcc end of chip, the output negative terminal of auxiliary source circuit connects former border district, the gate pole of first switching tube (Q1) connects the Gate end of chip (IC), its source electrode connects an end of sampling resistor (Rs), the former border district of another termination of sampling resistor; The anode of main transformer secondary winding termination output diode of the same name (D3), the negative electrode of output diode (D3) connects the anode of output capacitance (C3), the negative terminal of output capacitance (C3) connects the non-same polarity and the output ground of main transformer secondary winding, and output capacitance (C3) both end voltage is circuit of reversed excitation output voltage (Vo ').
4. a kind of auxiliary source circuit that is applicable to Switching Power Supply as claimed in claim 1, it is characterized in that described input voltage (Vin) is the inner square-wave voltage that produces of forward converter, described output voltage V o provides accessory power supply voltage for forward converter, described forward converter comprises forward converter input voltage (Vbus), auxiliary source circuit, chip (IC), main transformer (T1), first switching tube (Q1), sampling resistor (Rs), first resistance (R1), output rectification diode (D3), output fly-wheel diode (D4), outputting inductance (L2), output capacitance (C3), forward converter output voltage (Vo '), one end and the former limit of the main transformer winding end of the same name of positive termination first resistance (R1) of described forward converter input voltage (Vbus), described forward converter input voltage (Vbus) negative terminal is former border district, the Vcc end of another chip termination (IC) of first resistance (R1), the former limit of main transformer winding non-same polarity connects the drain electrode of first switching tube (Q1), the drain electrode of first switching tube (Q1) and former border district are two inputs of auxiliary source circuit, the output plus terminal of auxiliary source circuit connects the Vcc end of chip, the output negative terminal of auxiliary source circuit connects former border district, the gate pole of first switching tube (Q1) connects the Gate end of chip, its source electrode connects an end of sampling resistor (Rs), the former border district of another termination of sampling resistor (Rs); The anode of main transformer secondary winding termination output rectifier diode of the same name (D3), the negative electrode of output rectifier diode (D3) connects the negative electrode of output fly-wheel diode (D4) and an end of outputting inductance (L2), the anode of another termination output capacitance (C3) of outputting inductance (L2), the negative terminal of output capacitance (C3) connects the non-same polarity of main transformer secondary winding, the anode of fly-wheel diode (D4) and output ground, output capacitance (C3) both end voltage is forward converter output voltage (Vo ').
5. the auxiliary source circuit that is applicable to Switching Power Supply as claimed in claim 3, it is characterized in that described input voltage (Vin) is the inner square-wave voltage that produces of symmetrical half bridge circuit, described output voltage V o provides accessory power supply voltage for the symmetrical half bridge circuit, described symmetrical half bridge circuit comprises symmetrical half bridge circuit input voltage (Vbus), auxiliary source circuit, chip (IC), main transformer (T1), first resistance (R1), first switching tube (Q1), second switch pipe (Q2), first input capacitance (C3), second input capacitance (C4), the first output diode (D3), second output diode (D4), first output capacitance (C5), second output capacitance (C6), output voltage (Vo '), one end of positive termination first resistance (R1) of described symmetrical half bridge circuit input voltage (Vbus), input voltage (Vbus) negative terminal is former border district, the Vcc end of another chip termination (IC) of first resistance (R1), the source electrode of second switch pipe (Q2) connects the drain electrode and the former limit of the main transformer winding end of the same name of first switching tube (Q1), the drain electrode of second switch pipe (Q2) connects symmetrical half bridge circuit input voltage (Vbus) anode, the drain electrode of first switching tube (Q1) and former border district are two inputs of auxiliary source circuit, the output plus terminal of auxiliary source circuit connects the Vcc end of chip, the output negative terminal of auxiliary source circuit connects former border district, the source electrode of first switching tube (Q1) connects former border district, the gate pole of first switching tube (Q1) and second switch pipe (Q2) connects the Gate end of chip (IC), one termination symmetrical half bridge circuit input voltage (Vbus) anode of first input capacitance (C3), one end of another termination second input capacitance (C4) and the former limit of main transformer winding non-same polarity, another termination symmetrical half bridge circuit input voltage (Vbus) negative terminal of second input capacitance (C4); The negative electrode of the anode of main transformer secondary winding termination first output diode of the same name (D3) and second output diode (D4), the negative electrode of first output diode (D4) connects the anode of first output capacitance (C5), the anode of second output diode (D4) connects the negative terminal of second output capacitance (C6), the anode of the negative terminal of first output capacitance (C6) and second output capacitance (C5) links to each other and connects the non-same polarity of transformer secondary winding, the anode of first output capacitance (C5) is the anode of output voltage (Vo '), and the negative terminal of second output capacitance (C6) is the negative terminal of output voltage (Vo ').
6. the auxiliary source circuit that is applicable to Switching Power Supply as claimed in claim 3, it is characterized in that described input voltage (Vin) is the inner square-wave voltage that produces of asymmetry half-bridge circuit, described output voltage V o provides accessory power supply voltage for asymmetry half-bridge circuit, described asymmetry half-bridge circuit comprises asymmetry half-bridge circuit input voltage (Vbus), auxiliary source circuit, chip (IC), main transformer (T1), first resistance (R1), first switching tube (Q1), second switch pipe (Q2), capacitance (C7), the first output diode (D3), second output diode (D4), first output capacitance (C5), second output capacitance (C6), asymmetry half-bridge circuit output voltage (Vo '), one end of positive termination first resistance (R1) of described asymmetry half-bridge circuit input voltage (Vbus), the Vcc end of another chip termination (IC) of first resistance (R1), asymmetry half-bridge circuit input voltage (Vbus) negative terminal is former border district, one end of the drain electrode of the source electrode of second switch pipe (Q2) and first switching tube (Q1) and capacitance (C7), the drain electrode of second switch pipe (Q2) connects asymmetry half-bridge circuit input voltage (Vbus) anode, the source electrode of first switching tube (Q1) connects former border district, the drain electrode of first switching tube (Q1) and former border district are two inputs of auxiliary source circuit, the output plus terminal of auxiliary source circuit connects the Vcc end of chip, the output negative terminal of auxiliary source circuit connects former border district, the gate pole of first switching tube (Q1) and second switch pipe (Q2) connects the Gate end of chip, the end of the same name of another former limit of termination main transformer winding of capacitance (C7), the former limit of main transformer winding non-same polarity connects asymmetry half-bridge circuit input voltage (Vbus) negative terminal; The negative electrode of the anode of main transformer secondary winding termination first output diode of the same name (D3) and second output diode (D4), the negative electrode of first output diode (D3) connects the anode of first output capacitance (C5), the anode of second output diode (D4) connects the negative terminal of second output capacitance (C6), the anode of the negative terminal of first output capacitance (C5) and second output capacitance (C6) links to each other and connects the non-same polarity of transformer secondary winding, the anode of first output capacitance (C5) is the anode of output voltage (Vo '), and the negative terminal of second output capacitance (C6) is the negative terminal of output voltage (Vo ').
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| CN2010101339965A CN101771353B (en) | 2010-02-24 | 2010-02-24 | Auxiliary source circuit for switch power supply |
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| CN2917083Y (en) * | 2005-11-04 | 2007-06-27 | 周春香 | Normal/reverse excitation combined DC/DC isolated transformer |
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