CN2904457Y

CN2904457Y - Three state feedback power controlling circuit

Info

Publication number: CN2904457Y
Application number: CN 200620042424
Authority: CN
Inventors: 林新春
Original assignee: Shanghai Kunxiang Electronic Sci & Tech Co Ltd
Current assignee: Shanghai Chenrui Microelectronics Technology Co., Ltd.
Priority date: 2006-06-05
Filing date: 2006-06-05
Publication date: 2007-05-23
Anticipated expiration: 2016-06-05

Abstract

The utility model disclosing a tristate feedback power controlling circuit in a switch supply management IC comprises a charging capacitance, an internal power supply circuit, a signal processing element comprising a comparator A 1, and a controlling switch K 1 which is connected with the internal power supply circuit. The signal processing element also comprises a comparator A 2 parallel with the comparator A 1, and gate A 3. The anode input terminals of the comparator A 2 and the comparator A 1 are connected with the input power V I N, while the output terminals are connected with the two input terminals of the and the gate A 3 whose output terminal is connected with the controlling terminal of the controlling switch K 1. The hysteretic high point and the low point of the reference voltage input from the negative terminal of the comparator A 1 are the normal running voltage and the starting voltage of the system. The reference voltage input from the negative terminal of the comparator A 2 is between the starting voltage and the normal running voltage. The utility model can achieve that the loss of the whole power system is nearly zero in an unloaded or a short-circuit state, and can achieve the high efficiency in a light-load state.

Description

Ternary feedback power control circuit

Technical field

The utility model relates to a kind of interior three-state feedback power control circuit of Switching Power Supply managing chip with zero load, underloading and short-circuit protection function.

Background technology

Portable sets such as notebook computer, mobile phone, portable media player (comprising audio/video devices), digital camera, charger/adapter, power supply, PDA become the main application fields of Switching Power Supply managing chip.All Switching Power Supply control chips are operated in starting state and operating state at present; for underloading or unloaded some control chip of situation by the frequency reducing technology make power work underloading or when unloaded the switch operating frequency of power supply reduce power consumption; protection under the short-circuit condition is controlled power consumption by the power supply that reduces control chip; but the control chip of all Switching Power Supplies does not have ternary control technology; can't be implemented under unloaded and the short-circuit condition power consumption to internal system control to very little, so can't be implemented in super low energy consumption under short-circuit condition and the Light Condition.Its circuit structure is formed as shown in Figure 1, comprises a signal processing unit and a control switch K1 who is made of comparator A1, and the feedback voltage of this comparator A1 is system start-up voltage and normal working voltage.

The course of work of this circuit is as follows: when the operating voltage of input power supply VIN input less than starting resistor, comparator A1 output is a low level, control switch K1 is obstructed, interior power supply circuit is in not conducting, when operating voltage rises to operating voltage, comparator A1 output is a high level, control switch K1 conducting, interior power supply circuit enters operating state, after system enters operating state, all in running order under greater than the situation of starting resistor at operating voltage, less than starting resistor, system just enters starting state again up to operating voltage.Conclusion: the power work state of existing managing chip inside has only operating state and starting state, there is not the stand-by operation state, therefore can't be implemented in that the power consumption to internal system controls to very little under unloaded and the short-circuit condition, this circuit does not contain the startup power supply in addition, no matter be operating state or starting state, it all needs all or part of circuit working, so system power consumption itself is bigger.

Summary of the invention

The purpose of this utility model overcomes the deficiencies in the prior art, and a kind of ternary feedback power control circuit is provided, and this circuit can be implemented in the power consumption control of whole power-supply system under zero load, underloading and the short-circuit condition to very little.

The purpose of this utility model is achieved through the following technical solutions: a kind of ternary feedback power control circuit, comprise input power supply VIN, input capacitance CIN, interior power supply circuit, the signal processing unit and the control switch K1 that contain comparator A1, this comparator A1 is a hysteresis loop comparator, control switch K1 is connected to interior power supply circuit, described signal processing unit also comprises a comparator A2 in parallel with comparator A1, one and a door A3, the electrode input end of described comparator A2 and comparator A1 is connected to input power supply VIN, the output of described comparator A2 and comparator A1 is connected to two inputs described and door A3, described output with door A3 is connected the control end of control switch K1, the height point of the negative terminal input reference voltage hysteresis of described comparator A1 is a normal working voltage, the low spot of the negative terminal input reference voltage hysteresis of described comparator A1 is the starting resistor of system, and the negative terminal input reference voltage of described comparator A2 is between the starting resistor and normal working voltage of system.

Above-mentioned three-state feedback power control circuit, wherein, described comparator A2 can be the hysteresis loop comparator that has less hysteresis, the height point of its negative terminal input reference voltage hysteresis is between the starting resistor and normal working voltage of system, and the low spot of its negative terminal input reference voltage hysteresis is a system standby state operating voltage.

Above-mentioned three-state feedback power control circuit, wherein, the negative terminal of described comparator A1 input hysteresis reference voltage value is made as 3V～20v.

Above-mentioned three-state feedback power control circuit, wherein, comprise that also one starts power supply, a charge switch K2 and a reverser A4, charge switch K2 is connected input power supply VIN and starts between the power supply, the input of reverser A4 and output are connected to the output of comparator A1 and the control end of charge switch K2, be used to the system of being controlled at and be in starting state following time input capacitance CIN is charged, be in the charging of closing under normal operating conditions and the stand-by operation state in system input capacitance CIN.

Above-mentioned three-state feedback power control circuit, wherein, described control switch K1 and charge switch K2 can be active controlled device such as triode, field-effect transistor, MOSFET, electronic switch.

Above-mentioned three-state feedback power control circuit, wherein, the electrode input end of described comparator A2 and comparator A1 can connect one the tunnel and independently feed back power supply.

After having adopted the technical solution of the utility model, promptly ternary feedback power control circuit can be divided into starting state, normal operating conditions and three states of stand-by operation state to the operating state of the power supply in the power management chip, control system is under unloaded and short-circuit condition, system enters holding state, thereby make the power consumption of chip itself and the required power consumption of whole system almost be reduced to 0, and realize the high efficiency under the underloading condition.

Description of drawings

Fig. 1 is the power circuit schematic diagram in the existing Switching Power Supply managing chip;

Fig. 2 is a ternary feedback power control circuit schematic diagram of the present utility model;

Fig. 3 is an embodiment schematic diagram of ternary feedback power control circuit of the present utility model.

Embodiment

See also Fig. 2, ternary feedback power control circuit of the present utility model, comprise the input power supply, input capacitance CIN, signal processing unit 1, control switch K1, start power supply, charge switch K2, reverser A4 and interior power supply circuit 2, signal processing unit 1 contains comparator A1, comparator A2 and one and the door A3, comparator A1 and comparator A2 are for being connected in parallel, the electrode input end of comparator A2 and comparator A1 is connected to input power supply VIN, the output of comparator A2 and comparator A1 is connected to two inputs described and door A3, be connected control switch K1 control end with the output of door A3, control switch K1 is connected to interior power supply circuit 2, charge switch K2 is connected input power supply VIN and starts between the power supply, and the input of reverser A4 and output are connected to the output of comparator A1 and the control end of charge switch K2.

The negative terminal input hysteresis reference voltage value of comparator A1 is made as 3V～20V, if establishing the height point of the negative terminal input reference voltage hysteresis of comparator A1 is the normal working voltage 12V of system, the low spot of establishing the negative terminal input reference voltage hysteresis of comparator A1 is the starting resistor 6V of system.Comparator A2 can be general comparator, also can be for having the hysteresis loop comparator of less hysteresis, now the hysteresis loop comparator that has a less hysteresis with comparator A2 is an example, the height point of its negative terminal input reference voltage hysteresis is between the starting resistor and normal working voltage of system, if it is 9.2V, the low spot of the negative terminal input reference voltage hysteresis of comparator A2 is the holding state operating voltage of system, establishes it and is 9V.

In one embodiment, see also Fig. 3, the electrode input end of ternary feedback also described comparator A2 of power control circuit of the present utility model and comparator A1 can connect one the tunnel and independently feed back power supply, this feedback power supply can be the power supply behind the input power supply process electric resistance partial pressure, also can be the feedback power supply of interior power supply circuit 2 outputs.

When providing the operating voltage of system, input power supply VIN reaches from 6V to the process that rises to normal working voltage 12V less than starting resistor 6V, comparator A1 output low level, at operating voltage at 6V between the 9.2V, comparator A2 output low level, with door A3 output also be low level, not conducting of control switch K1, interior power supply circuit 2 is not worked and is in starting state, this moment, charge switch K2 was because reverser A4 exports high level and closed conducting, and starting power supply can charge to input capacitance CIN by charge switch K2; After operating voltage reaches more than the 9.2V, comparator A2 exports high level, with door A3 output still be low level, not conducting of control switch K1, interior power supply circuit 2 is not worked and is in starting state, after operating voltage reaches normal working voltage 12V, comparator A1 output is a high level, A4 is output as low level by reverser, this moment, charge switch K2 disconnected not conducting, started power supply and stopped the charging to input capacitance CIN, and comparator A2 output still is high level, be high level then with door A3 output, control switch K1 conducting, interior power supply circuit 2 begins to enter normal operating conditions, enters after the normal operating conditions, the system works power supply is provided by operating voltage, and system operation voltage all is in normal operating conditions between 12V and 9V; When the operating state of system by certain reason when entering zero load/underloading and short-circuit condition, system operation voltage will reduce, when system operation voltage is reduced to below the 9V, comparator A2 overturns and output low level, not conducting of control switch K1, and interior power supply circuit 2 is not worked, input capacitance CIN is not charged yet, the voltage of input on the power supply can descend very slowly like this, and the required electric current of chip operation is reduced to μ A level, can keep system almost not have power consumption in long time.Circuit working enters the maintenance operating state, and this state can remain to system operation voltage always and drop between the 6V from 9V, when system operation voltage less than 6V, system is from newly entering starting state.

Can reach a conclusion by above-mentioned operation principle, ternary feedback power control circuit of the present utility model can be implemented in that the power consumption to internal system controls to very little under unloaded and the short-circuit condition, thereby make the power consumption of chip itself and the required power consumption of whole system almost be reduced to 0, and realize the high efficiency under the underloading condition.

Above embodiment is only for the usefulness that the utility model is described, but not to restriction of the present utility model, person skilled in the relevant technique, under the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.

Claims

1, a kind of ternary feedback power control circuit, comprise input power supply (VIN), input capacitance (CIN), interior power supply circuit, the signal processing unit and the control switch (K1) that contain comparator (A1), this comparator (A1) is a hysteresis loop comparator, control switch (K1) is connected to interior power supply circuit, it is characterized in that, described signal processing unit also comprises a comparator (A2) in parallel with comparator (A1), one and door (A3), the electrode input end of described comparator (A2) and comparator (A1) is connected to input power supply (VIN), the output of described comparator (A2) and comparator (A1) is connected to two inputs described and door (A3), described output with door (A3) is connected the control end of control switch (K1), the height point of the negative terminal input reference voltage hysteresis of described comparator (A1) is a normal working voltage, the low spot of the negative terminal input reference voltage hysteresis of described comparator (A1) is the starting resistor of system, and the negative terminal input reference voltage of described comparator (A2) is between the starting resistor and normal working voltage of system.

2. ternary feedback power control circuit according to claim 1, it is characterized in that, described comparator (A2) can be the hysteresis loop comparator that has less hysteresis, the height point of its negative terminal input reference voltage hysteresis is between the starting resistor and normal working voltage of system, and the low spot of its negative terminal input reference voltage hysteresis is the system standby operating voltage.

3. ternary feedback power control circuit according to claim 1 is characterized in that, the negative terminal input hysteresis reference voltage value of described comparator (A1) is made as 3V～20v.

4. ternary feedback power control circuit according to claim 1, it is characterized in that, comprise that also one starts power supply, one charge switch (K2) and a reverser (A4), described charge switch (K2) is connected input power supply (VIN) and starts between the power supply, the input of described reverser (A4) and output are connected to the output of comparator (A1) and the control end of charge switch (K2), be used to the system of being controlled at and be in starting state following time input capacitance (CIN) is charged, be in the charging of closing under normal operating conditions and the stand-by operation state in system input capacitance (CIN).

5. ternary feedback power control circuit according to claim 4 is characterized in that described control switch (K1) and charge switch (K2) can be active controlled device such as triode, field-effect transistor, MOSFET, electronic switch.

6. ternary feedback power control circuit according to claim 1 is characterized in that the electrode input end of described comparator (A2) and comparator (A1) can connect one the tunnel and independently feed back power supply.