JP4925804B2 - Air conditioner - Google Patents

Description

The present invention relates to air conditioner that can reduce the power consumption in the standby state.

  In recent years, from the viewpoint of energy saving, electric power consumption in a standby state has been reduced in electrical products such as air conditioners, televisions, and copiers. In the air conditioner, the main power supply is in an on state, but a state in which various functions are not used and a control signal from the remote controller is waited is a standby state. In a television, the main power supply is in an on state, but a state in which the power is turned off by a remote controller is a standby state. In the copying machine, the main power supply is in an on state, but a state in which various functions are not used is a standby state.

  In order to reduce power consumption in such a standby state, for example, a switching power supply circuit using a switching regulator that operates intermittently in the standby state has been proposed (see Patent Document 1).

  FIG. 3 is a circuit diagram showing a conventional switching power supply circuit. The switching power supply circuit shown in FIG. 3 includes a transformer 11 having a primary winding and two secondary windings (not shown), a switching control circuit 12 connected to the primary winding of the transformer 11, Rectifying and smoothing circuits 13 and 14 respectively connected to the secondary windings of the unit 11. In the example shown in FIG. 3, the transformer 11 has two secondary windings, and the rectifying / smoothing circuit 13 connected to one of the secondary windings outputs a DC voltage of 18 V, and the other 2 The rectifying / smoothing circuit 14 connected to the next winding outputs a DC voltage of 5V. The height of the output DC voltage can be controlled by determining the number of turns of the primary winding and the secondary winding of the transformer 11.

  The switching power supply circuit boosts or lowers the DC voltage input via the switching control circuit 12 with the transformer 11, rectifies and smoothes it with the rectifying and smoothing circuits 13 and 14, and then applies a predetermined high voltage to the electrical equipment as a load. Supply a direct current voltage.

  In order to supply a DC voltage of a predetermined height to the electrical equipment, the output of the rectifying / smoothing circuit 14 is fed back to the switching control circuit 12, and the switching frequency is controlled by the switching control circuit 12 to increase the DC voltage to be supplied. Is maintained at a predetermined voltage. Specifically, the output voltage is fed back by the resistance elements 15 and 16, the shunt regulator 17, and the feedback circuit 18. Since the reference voltage of the shunt regulator 17 is set to 2.5 V according to the standard, the resistance values of the resistance elements 15 and 16 are determined so that the divided voltage is 2.5 V with respect to the 5 V output.

  The feedback circuit 18 generates a feedback signal for requesting increase / decrease of the output voltage based on the output of the shunt regulator 17 and outputs the feedback signal to the switching control circuit 12. The switching control circuit 12 increases or decreases the output voltage by adjusting the switching frequency based on the feedback signal, and keeps the output voltage constant.

In the power supply circuit shown in FIG. 3, the switching control circuit 12 has a function of intermittently driving the transformer 11 in order to reduce power consumption in the standby state described above. For this reason, the switching control circuit 12 is connected to a standby circuit 19 that turns a specific port of the switching control circuit 12 low when a signal indicating a standby state (standby control signal) is input from the outside. When becomes low, the switching control circuit 12 is configured to intermittently drive the transformer 11.
JP-A-10-205854

  The power supply circuit described above tries to keep power consumption in the standby state low by intermittently driving the transformer 11, but it is necessary to receive a control signal from, for example, a remote controller even in the standby state. In addition, it is necessary to keep the DC voltage supplied to the load at a predetermined value or higher. Even in the case of intermittent driving in a standby state, the output voltage of one rectifying / smoothing circuit 14 that feeds back the output voltage is maintained at the same value as the output voltage during operation. In the example shown in FIG. 3, since the output voltage is fed back in order to maintain the output voltage (= 5V) of the rectifying / smoothing circuit 14, the output voltage of the rectifying / smoothing circuit 14 falls below 5V due to intermittent driving. In this case, since the switching control circuit 12 attempts to boost the voltage by changing the switching frequency, not only the output voltage of the feedback rectifying and smoothing circuit 14 but also the output voltage of the rectifying and smoothing circuit 13 inevitably increases by about 4V to 8V. To do.

  The rectifying / smoothing circuit generally includes a diode that is a rectifying element and an electrolytic capacitor that smoothes alternating current. However, since the output voltage of the rectifying / smoothing circuit 13 increases in the standby state as described above, The circuit 13 has a problem that an electrolytic capacitor having a high withstand voltage must be used.

  Moreover, since reduction of power consumption in the standby state is required, it is required to simplify the circuit configuration.

The present invention has been made in view of such circumstances, and is configured such that the voltage supplied to the operating unit in the standby state is lower than the voltage supplied to the operating unit in the operating state (non-standby state). An object of the present invention is to provide an air conditioner that can reduce power consumption in a standby state .

Another object of the present invention is to operate the first and second resistance elements connected in parallel to the secondary winding of the transformer, the third resistance element connected in parallel to the first resistance element, and the load. A switching element that opens and closes according to the state and a voltage stabilizing element that stabilizes the voltage divided by the first and second resistance elements, and controls the switching frequency according to the voltage output by the voltage stabilizing element. It is in providing the air conditioner which can make variable the voltage supplied according to the operation state of load by setting it as the structure to perform.

Still another object of the present invention is to provide an air conditioner that can reduce the power supplied to the load even when the circuit configuration is simplified by using a shunt regulator. is there.

Still another object of the present invention is to supply a load even when the circuit configuration is simplified by connecting the connection node of the first and second resistance elements and the reference terminal of the shunt regulator. An object of the present invention is to provide an air conditioner that can reduce the power source to be used.

An air conditioner according to the present invention operates a switching element connected to a primary winding of a transformer at an appropriate switching frequency, and a plurality of load resistors connected to a plurality of secondary windings provided in the transformer. In an air conditioner comprising a switching power supply circuit that supplies voltages to a plurality of supply destinations and an operation unit that operates by being supplied with a voltage from the switching power supply circuit, a signal for controlling the operation of the operation unit is externally provided. A receiving unit that receives the signal, a control unit that controls the operation of the operating unit based on the received signal, an operating state in which the operating unit performs an air conditioning operation, and a standby state in which the air conditioning operation is not performed. Switching means for switching based on the received signal, and the voltage supplied through one load resistor provided in the switching power supply circuit, the operating section is in an operating state Or a circuit for controlling the switching frequency to be set according to whether it is in a standby state, the circuit comprising first and second resistance elements connected in parallel to the one load resistance, the first resistance Voltage stabilization that stabilizes the voltage divided by the third resistance element connected in parallel to the element, the switching element that opens and closes according to the operating state or the standby state, and the first and second resistance elements comprising a device, characterized Citea Rukoto to control the switching frequency according to the output voltage of said voltage stabilizing element.

  In the present invention, since the level of the voltage to be supplied is variable according to the operating state of the load connected to the secondary winding of the transformer, for example, when the load is in a standby state, switching is performed. By increasing the frequency, the supply voltage to the load increases. When the load is in a non-standby state, the supply voltage to the load is decreased by decreasing the switching frequency.

  In the present invention, when the switching element is in the open state, the voltage divided by the first and second resistance elements is stabilized, and when the switching element is in the closed state, the first and third resistors The voltage divided by the combined resistance of the element and the second resistance element is stabilized. Therefore, the voltage supplied from the transformer is variable according to the opening / closing of the switching element.

The air conditioner according to the present invention is characterized in that the voltage stabilizing element is a shunt regulator.

  In the present invention, since the shunt regulator is used as the voltage stabilizing element, the output voltage is stabilized by changing the voltage drop at the resistance element connected in parallel with the shunt regulator.

The air conditioner according to the present invention is characterized in that a connection node of the first and second resistance elements is connected to a reference terminal of the shunt regulator.

  In the present invention, since the connection node of the first and second resistance elements and the reference terminal of the shunt regulator are connected, when the switching element is in the open state, it is divided by the first and second resistance elements. When the pressed voltage is stabilized and the switching element is in the closed state, the voltage divided by the combined resistance of the first and third resistance elements and the second resistance element is stabilized.

  In the present invention, since the operation unit that operates by the voltage supplied from the above-described switching power supply circuit is provided, the number of components (circuits) that are conventionally required to reduce the power consumption in the standby state is reduced. Further, even when intermittent transmission is not performed, the power consumption in the standby state can be kept low.

  In the present invention, since the voltage to be supplied to the operating unit in the standby state is set lower than the voltage supplied during the operation, the power consumption in the standby state can be kept low.

  In the case of the present invention, since the level of the voltage to be supplied is variable according to the operating state of the load connected to the secondary winding of the transformer, it is conventionally necessary to reduce the power consumption in the standby state. The intermittent transmission parts (circuits) are no longer necessary. Further, even when intermittent transmission is not performed, the control voltage in the standby state can be reduced, and power consumption can be suppressed. Furthermore, when a load is connected to the secondary winding of the transformer, the voltage supplied to the load can be lowered, so a high voltage capacitor is not required, and the component cost can be kept low.

  According to the present invention, when the switching element is in the open state, the voltage divided by the first and second resistance elements is stabilized, and when the switching element is in the closed state, the first and third resistance elements are In order to stabilize the voltage divided by the combined resistance and the second resistance element, the voltage supplied from the transformer can be made variable according to the opening / closing of the switching element. Therefore, the voltage supplied according to the operating state of the load can be varied by adopting a circuit configuration in which the switching element is opened and closed according to the operating state of the load.

  In the case of the present invention, since the shunt regulator is used as the voltage stabilizing element, the output voltage can be stabilized by changing the voltage drop at the resistance element connected in parallel with the shunt regulator.

  According to the present invention, since the connection node of the first and second resistance elements and the reference terminal of the shunt regulator are connected, the voltage is divided by the first and second resistance elements when the switching element is in the open state. The voltage divided by the combined resistance of the first and third resistance elements and the second resistance element can be stabilized when the switching element is in the closed state. .

  In the case of the present invention, since the operation unit that operates by the voltage supplied from the above-described switching power supply circuit is provided, it is possible to reduce the number of components (circuits) conventionally required to reduce power consumption in the standby state. . Further, even when intermittent transmission is not performed, the power consumption in the standby state can be kept low.

  According to the present invention, since the voltage to be supplied to the operating unit in the standby state is set lower than the voltage supplied during the operation, the power consumption in the standby state can be kept low.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
Embodiment 1 FIG.
FIG. 1 is a circuit diagram showing a switching power supply circuit according to the present invention. The switching power supply circuit according to the present invention includes a transformer 110 having one primary winding 111 and two secondary windings 112 and 113, a switching control circuit 120 connected to the primary winding 111, and a secondary winding. The rectifying / smoothing circuits 130 and 140 as voltage stabilizing circuits connected to 113 are provided.

  The switching power supply circuit boosts or lowers the DC voltage input via the switching control circuit 120 by the transformer 110 and rectifies and smoothes it by the rectifying and smoothing circuits 130 and 140. Therefore, the rectifying / smoothing circuit 130 includes a diode 131 connected in series to the secondary winding 112, an electrolytic capacitor 132 and a load resistor 133 connected in parallel, and the voltage rectified by the diode 131 is smoothed by the electrolytic capacitor 132. The output voltage is taken out from the load resistor 133. The rectifying / smoothing circuit 130 outputs a DC voltage of 18V, for example. The configuration of the rectifying / smoothing circuit 140 is the same as the configuration of the rectifying / smoothing circuit 130, and includes a diode 141 connected to the secondary winding 113, an electrolytic capacitor 142 connected in parallel, and a load resistor 143. The rectifying / smoothing circuit 140 variably outputs a DC voltage of 5 V or 3.5 V depending on the operating state of the DC voltage supply destination. Specifically, when the load to which the DC voltage is supplied is in a normal driving state (non-standby state), a DC voltage of 5 V is output, and when it is in a standby state, a DC voltage of 3.5 V is output. To do.

  The switching power supply circuit feeds back the output of the rectifying / smoothing circuit 140 to the switching control circuit 120 in order to stably supply a DC voltage to the connected load, and the switching control circuit 120 controls the switching frequency. Specifically, the output voltage is fed back by the resistance elements 151 and 152, the shunt regulator 153, and the feedback circuit 160. The two resistance elements 151 and 152 are connected in parallel to the rectifying and smoothing circuit 140, and the connection node A of the resistance elements 151 and 152 and the reference terminal B of the shunt regulator 153 are connected. The anode side of the shunt regulator 153 is grounded, and the cathode side is connected to the feedback circuit 160.

  In order to output a 5V DC voltage in a normal driving state of the load, the resistance values of the resistance elements 151 and 152 are determined so that the divided voltage is 2.5V with respect to the 5V output. Specifically, the resistance values of the resistance elements 151 and 152 are both set to 2.4 kΩ. The feedback circuit 160 generates a feedback signal that requests an increase / decrease in the output voltage based on the output of the shunt regulator 153 and outputs the feedback signal to the switching control circuit 120. The switching switching circuit 120 increases or decreases the output voltage by adjusting the switching frequency based on the feedback signal, and maintains an output of 5 V in the normal driving state of the load.

  In addition, the switching power supply circuit of the present invention includes a transistor 161 and a resistance element 162 connected in parallel to the resistance element 151 in order to change the height of the DC voltage supplied to the load. The resistor 161 is connected to the collector of the transistor 161, and the output voltage of the rectifying and smoothing circuit 140 is applied between the emitter and the collector. In addition, a control signal indicating that the electrical device is in a standby state is input to the base of the transistor 161. That is, the control signal that turns off the transistor 161 when the electrical device to which the DC voltage is supplied is in a normal driving state (non-standby state) and turns on the transistor 161 when in a standby state. Is entered.

  When the transistor 161 is off (that is, when the load is in a normal driving state), the output voltage of the rectifying and smoothing circuit 140 is 5 V as described above. In addition, when the transistor 161 is turned on (that is, when the load is in a standby state), the combined resistance of the resistance elements 151 and 162 and the divided voltage by the resistance element 152 become the reference voltage of the shunt regulator 153. The output voltage can be changed by setting the resistance value of the element 162 to an appropriate value. In the present embodiment, the resistance value of the resistance element 162 is 1.64 kΩ, and the output of the rectifying and smoothing circuit 140 is 3.5 V in the standby state.

  As described above, since the intermittent transmission component (the standby circuit 19 shown in FIG. 3), which has been conventionally required to reduce the power consumption in the standby state, is not used, the circuit configuration is simplified and consumed. Electric power can be reduced. In addition, since the output voltage of the rectifying / smoothing circuit 140 can be lowered without performing intermittent transmission, the output voltage of the other rectifying / smoothing circuit 130 is also lowered at the same time in the standby state, and the withstand voltage of the electrolytic capacitor 132 can be reduced. Can be lowered compared to.

  In this embodiment, the transformer 110 in which two secondary windings 112 and 113 are provided for one primary winding 111 is used. However, the configuration is not necessarily limited to such a configuration. No, it may be configured to provide one secondary winding, or may be configured to provide three or more secondary windings.

  In this embodiment, the output voltage of the rectifying / smoothing circuit 140 in the normal driving state is 5 V, and the output voltage of the rectifying / smoothing circuit 140 in the standby state is 3.5 V. However, the resistances of the resistance elements 151, 152, and 162 are By changing the value, the output voltage can be changed. When the resistance values of the resistance elements 151, 152, and 162 are R1, R2, and R2, respectively, the reference voltage of the shunt regulator 153 is 2.5 V, so the output voltage in the normal driving state is (1 + R1 / R2) × 2 The output voltage in the standby state is (1 + R1 × R3 / (R2 × (R1 + R3))) × 2.5V.

  In this embodiment, the shunt regulator 153 is used as the voltage stabilizing element. However, the voltage stabilizing circuit may be configured using a Zener diode and a resistance element.

Embodiment 2. FIG.
In the present embodiment, the configuration of an air conditioner including the above-described switching power supply circuit will be described.

  FIG. 2 is a circuit diagram showing a configuration of an air conditioner provided with the switching power supply circuit of the present invention. Air conditioner 100 according to the present embodiment is a device operated by remote controller 101. The air conditioner 100 includes an operation unit 200 including a receiving unit 201 that receives an infrared signal transmitted from the remote controller 101, and a control unit 202 that controls various hardware based on the received infrared signal.

  When any operation is performed on the remote controller 101, the remote controller 101 transmits an infrared signal of a predetermined format to the air conditioner 100. When an infrared signal transmitted from the remote controller 101 is received, the control unit 202 determines whether or not the signal has a predetermined content, and controls various hardware in accordance with the determination result, thereby according to the present invention as a whole. It functions as an air conditioner. At this time, the rectifying / smoothing circuit 130 in the switching power supply circuit described above outputs a DC voltage of 18V, and the rectifying / smoothing circuit 140 outputs a DC voltage of 5V.

  Further, when the air conditioner 100 is turned off by the operation of the remote controller 101, the control unit 202 outputs a control signal indicating that it is in a standby state to the transistor 161 in the switching power supply circuit. At this time, since the transistor 161 is turned on, the voltage divided by the combined resistance of the resistance elements 151 and 162 and the resistance element 152 becomes the reference voltage of the shunt regulator 153, and the output voltage of the rectifying and smoothing circuit 140 becomes 3.5V.

  As described above, since the intermittent transmission component (the standby circuit 19 shown in FIG. 3), which has been conventionally required to reduce the power consumption in the standby state, is not used, the circuit configuration is simplified and consumed. Electric power can be reduced. In addition, since the output voltage of the rectifying / smoothing circuit 140 can be lowered without performing intermittent transmission, the output voltage of the other rectifying / smoothing circuit 130 is also lowered simultaneously in the standby state, and the withstand voltage of the electrolytic capacitor 132 is reduced. Can be lowered compared to.

It is a circuit diagram which shows the switching power supply circuit which concerns on this invention. It is a circuit diagram which shows the structure of the air conditioner provided with the switching power supply circuit of this invention. It is a circuit diagram which shows the conventional switching power supply circuit.

Explanation of symbols

110 Transformer 111 Primary winding 112, 113 Secondary winding 120 Switching control circuit
130,140 Rectifier smoothing circuit 151,152,162 Resistance element 153 Shunt regulator 160 Feedback circuit 161 Transistor

Claims (3)

A switching element connected to the primary winding of the transformer is operated at an appropriate switching frequency, and a voltage is supplied to a plurality of supply destinations through a plurality of load resistors connected to the plurality of secondary windings provided in the transformer. In an air conditioner comprising: a switching power supply circuit that operates; and an operation unit that operates by being supplied with voltage from the switching power supply circuit
A receiving unit for receiving a signal for controlling the operation of the operating unit from the outside;
A control unit for controlling the operation of the operation unit based on the received signal;
Switching means for switching between an operating state in which the air conditioning operation is performed by the operating unit and a standby state in which the air conditioning operation is not performed based on a signal received by the receiving unit;
A circuit for controlling the switching frequency to set a voltage level supplied through one load resistor included in the switching power supply circuit according to whether the operating unit is in an operating state or a standby state. ,
The circuit is
First and second resistance elements connected in parallel to the one load resistor;
A third resistive element connected in parallel to the first resistive element, an open / close element that opens and closes according to the operating state or standby state, and
A voltage stabilizing element for stabilizing the voltage divided by the first and second resistance elements;
Air conditioner according to claim Citea Rukoto to control the switching frequency according to the output voltage of said voltage stabilizing element. The air conditioner according to claim 1 , wherein the voltage stabilizing element is a shunt regulator. The air conditioner according to claim 2 , wherein a connection node of the first and second resistance elements is connected to a reference terminal of the shunt regulator.

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